Screening for depressive symptoms among children, could begin as early as the second grade, according to a new University of Washington study.
In the study, the researchers followed nearly 1,000 children from the second to the eighth grades, and found five distinct patterns for the way symptoms of depression develop among adolescents.
"Some children are reporting that they don't have as many friends, feel lonelier and are more anxious than their peers. They are telling us that they feel different from the typical happy- go-lucky second grader," said Dr. James Mazza, a UW professor of educational psychology and lead author of the study.
The new study was based on annual self reports from the children as well as parental and teacher evaluations collected as part of the Raising Healthy Children study.
It used data from 511 boys and 440 girls, and 81 percent of the participants were white.
The researchers identified five patterns of depression symptoms, but 56 percent of the children showed no or very few symptoms of depression in the second grade.
The five patterns of depression symptoms the researchers found and the percentage of students in each group are:
Low stables - 26 percent-these children showed none or very few signs of depression in the second grade and their rates didn't change over time through the eighth grade.
Low risers - 30 percent-children in this group also had no or few symptoms in the second grade, but the number went up by a small amount in subsequent years.
Mild stables - 24 percent-this group had few symptoms and then went up by a small amount in subsequent years.
Moderate changers - 11 percent-these children started out with a few more symptoms than the previous group and their number of symptoms rose through elementary school and then dropped in middle school.
Moderate risers - 9 percent-this group started off with a similar number of symptoms as the moderate changers, however their symptoms did not decrease in middle school.
The study identified different early depression risk factors for boys and girls.
For boys, behaviour and attention problems predicted membership in the different depression groups. For girls anxiety was an early risk factor.
The research also reaffirmed previous findings showing gender differences in underlying depressive symptoms, with girls experiencing more symptoms than boys in the eighth grade.